The bruising of the arm after the blood is drawn is mostly due to the lack of timely pressure after the blood is drawn, causing the bleeding blood vessels to bleed out gradually under the skin, resulting in the accumulation of bruises. After such a situation, the following treatment can be performed: First, continue to apply pressure to reduce bleeding, and after the blood vessels are closed, you can apply potato chips to reduce local swelling and edema, and to reduce pain. After 24 hours, apply warm water bags for hot compresses to increase blood circulation and promote the absorption and metabolism of blood stasis. Third, oral administration of blood circulation, blood stasis, swelling and pain relief Chinese medicine, such as blood circulation and pain relief capsules, to increase local blood circulation, can effectively reduce the metabolism of inflammatory metabolites, play a role in reducing pain and swelling.